Mike,
It all depends on what you want to do. All the permaview is the generation of a link to open with the current tiddlers in the story view. There are other ways to achieve the same thing.
I agree the url should be available somewhere, but I don't think you necessarily need it to do what you are thinking.
For example a filter can be passed in the url and that folder could access another tiddlers "list" field or text contents with a list of tiddlers. Then add to that startup actions and you can do almost anything. Perhaps return to the specific thing or a list of things you want to occur and we can consider the various ways to do it.
Remember by definition a URL with parameters/permaview is in a sense a fixed bookmark to open the wiki in a particular state.
Regards
Tones